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Finding the Fourth Proportional to 311.90, 468.12 and 129.43

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Solution

The fourth proportional to 311.90, 468.12 and 129.43 is: 194.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.90 : 468.12 = 129.43 : x
  2. Step 2: Convert to fraction form
    311.90/468.12 = 129.43/x
  3. Step 3: Cross multiply
    311.90x = 468.12 × 129.43
  4. Step 4: Simplify right side
    311.90x = 60,588.77
  5. Step 5: Solve for x
    x = 60,588.77/311.90
  6. Step 6: Final answer
    x = 194.26

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.